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A cone, when radius is 4 and height is 21, has a volume of 351.86 units3

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Q: What is the volume of a cone when radius is 4 and height is 21?

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21

If the height is 9 and the volume is 21, then the radius = 0.8618

The base radius is 3.517 cm

V = (1/3)pi*r2*h V = (1/3)pi(1 cm)2 * 20cm = 21 cm3 =======

Volume of cone: 1/3*pi*16^2 *21 = 5629.734 cubic feet rounded to 3 decimal places

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21

If the height is 9 and the volume is 21, then the radius = 0.8618

The base radius is 3.517 cm

V = (1/3)pi*r2*h V = (1/3)pi(1 cm)2 * 20cm = 21 cm3 =======

Volume of cone: 1/3*pi*16^2 *21 = 5629.734 cubic feet rounded to 3 decimal places

A cylinder with a radius of 21 inches and a height of 98 inches has a volume of 135,773.35 cubic inches. This cylinder would have a volume of 587.763 US gallons.

21

Volume = pi*r2*h = 21375 cubic ft (approx)

Volume = pi*182*21 = 21,375.396 cubic feet to 3 decimal places

Total surface area of cone = (pi*radius*slant height) + (pi*radius2) Area = (pi*12*21) + (pi*122) = 1244.070691 or about 1244 square m

The surface area of a cone if the height is 21 and the diameter is 19 is 971.43 units2

The volume of a sphere with a radius of 21 units is: 12,348 units 3